In which of the following attack techniques does an attacker try to intercept the successful handshake and then use a dictionary attack to retrieve the shared key?

Question

Options

• AShared key guessing
• BBrute force attack
• CDictionary attack
• DPSK cracking

• A
  18% (7)
• B
  8% (3)
• C
  3% (1)
• D
  73% (29)

Explanation

PSK cracking is an attack technique in which an attacker tries to intercept the successful handshake and then uses a dictionary attack to retrieve the shared key. Answer: A is incorrect. Shared key guessing is an attack technique in which an intruder by use of various cracking tools tries to guess the shared key of a wireless network and gain access to it. Answer: C is incorrect. A dictionary attack is a technique for defeating a cipher or authentication mechanism by trying to determine its decryption key or passphrase by searching likely possibilities. A dictionary attack uses a brute-force technique of successively trying all the words in an exhaustive list (from a pre- arranged list of values). In contrast with a normal brute force attack, where a large proportion key space is searched systematically, a dictionary attack tries only those possibilities which are most likely to succeed, typically derived from a list of words in a dictionary. Generally, dictionary attacks succeed because many people have a tendency to choose passwords which are short (7 characters or fewer), single words found in dictionaries, or simple, easily-predicted variations on words, such as appending a digit. Answer: B is incorrect. In a brute force attack, an attacker uses software that tries a large number of the keys combinations in order to get a password. To prevent such attacks, users should create passwords more difficult to guess, e.g., using a minimum of six characters, alphanumeric combinations, and lower-upper case combinations, etc.

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